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The simplest way to collect the visitor IP address in PHP is the REMOTE_ADDR. Pass the 'REMOTE_ADDR' in PHP $_SERVER variable. It will return the IP address of the visitor who is currently viewing the webpage.
$_SERVER['REMOTE_ADDR'] Returns the IP address from where the user is viewing the current page. $_SERVER['REMOTE_HOST'] Returns the Host name from where the user is viewing the current page. $_SERVER['REMOTE_PORT']
Using getenv() function: To get the IP Address,we use getenv(“REMOTE_ADDR”) command. The getenv() function in PHP is used for retrieval of values of an environment variable in PHP.
Client IP addresses describe only the computer being used, not the user. If multiple users share the same computer, they will be indistinguishable. Many Internet service providers dynamically assign IP addresses to users when they log in.
Try this php code.
<?PHP
function getUserIP()
{
// Get real visitor IP behind CloudFlare network
if (isset($_SERVER["HTTP_CF_CONNECTING_IP"])) {
$_SERVER['REMOTE_ADDR'] = $_SERVER["HTTP_CF_CONNECTING_IP"];
$_SERVER['HTTP_CLIENT_IP'] = $_SERVER["HTTP_CF_CONNECTING_IP"];
}
$client = @$_SERVER['HTTP_CLIENT_IP'];
$forward = @$_SERVER['HTTP_X_FORWARDED_FOR'];
$remote = $_SERVER['REMOTE_ADDR'];
if(filter_var($client, FILTER_VALIDATE_IP))
{
$ip = $client;
}
elseif(filter_var($forward, FILTER_VALIDATE_IP))
{
$ip = $forward;
}
else
{
$ip = $remote;
}
return $ip;
}
$user_ip = getUserIP();
echo $user_ip; // Output IP address [Ex: 177.87.193.134]
?>
This is the most common technique I've seen:
function getUserIP() {
if( array_key_exists('HTTP_X_FORWARDED_FOR', $_SERVER) && !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ) {
if (strpos($_SERVER['HTTP_X_FORWARDED_FOR'], ',')>0) {
$addr = explode(",",$_SERVER['HTTP_X_FORWARDED_FOR']);
return trim($addr[0]);
} else {
return $_SERVER['HTTP_X_FORWARDED_FOR'];
}
}
else {
return $_SERVER['REMOTE_ADDR'];
}
}
Note that it does not guarantee it you will get always the correct user IP because there are many ways to hide it.
This is my approach:
function getRealUserIp(){
switch(true){
case (!empty($_SERVER['HTTP_X_REAL_IP'])) : return $_SERVER['HTTP_X_REAL_IP'];
case (!empty($_SERVER['HTTP_CLIENT_IP'])) : return $_SERVER['HTTP_CLIENT_IP'];
case (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) : return $_SERVER['HTTP_X_FORWARDED_FOR'];
default : return $_SERVER['REMOTE_ADDR'];
}
}
How to use:
$ip = getRealUserIp();
Proxies may send a HTTP_X_FORWARDED_FOR header but even that is optional.
Also keep in mind that visitors may share IP addresses; University networks, large companies and third-world/low-budget ISPs tend to share IPs over many users.
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